Git-Pull Request mergen for beginners

My project “KnowYourStack.com” (the working title was BizzBingo – a detailed blogpost will follow soon) lays on GitHub and I’ve recognized a Problem where Daniel Lang helped me a lot. At the end he created a Fork for my Project and laid a Pull Request:

The question is: How do I transfer the changes to me?

Because I’m a totally beginner in Git/GitHub I’m going to write it down step by step. The help page on GitHub was a good introduction but at last I need to merge several files during this action which makes this a lot more complicated.

Beware: Before you start make sure you already created a Mergetool. It’s not that difficult and you will find a detailed instruction here. In fact all you have to do is to choose a Merge Program (I’ve chosen KDiff3 but it’s ugly). And after that you need to tell Git which tool is the right one for the mergen process. At the end that’s what the .gitconfig looks like: